Organic electroluminescence display device

ABSTRACT

An organic electroluminescence display device includes: a lower electrode that is made of a conductive inorganic material and formed in each of pixels arranged in a matrix in a display area; a light-emitting organic layer that is in contact with the lower electrode and made of a plurality of different organic material layers including a light-emitting layer emitting light; an upper electrode that is in contact with the light-emitting organic layer, formed so as to cover the whole of the display area, and made of a conductive inorganic material; and a conductive organic layer that is in contact with the upper electrode, formed so as to cover the whole of the display area, and made of a conductive organic material.

CROSS-REFERENCE TO RELATED APPLICATION

The present application claims priority from Japanese application JP2013-206170 filed on Oct. 1, 2013, the content of which is herebyincorporated by reference into this application.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to an organic electroluminescence displaydevice.

2. Description of the Related Art

In recent years, image display devices (hereinafter referred to as“organic EL (Electro-Luminescence) display devices”) using aself-luminous body called an organic light-emitting diode (OLED) havebeen put to practical use. Since the self-luminous body used, theorganic EL display devices are superior in terms of visibility andresponse speed, compared to a related-art liquid crystal display device,and in addition, a further reduction in thickness is possible because anauxiliary lighting device such as a backlight is not necessary.

In a so-called top-emission display device of the organic EL displaydevices, light is emitted toward the side of a substrate on whichelements are formed. In the top-emission display device, an upperelectrode of the upper electrode and a lower electrode as two electrodesthat interpose an organic layer including a light-emitting layertherebetween is an electrode that covers the whole surface of a displayarea where the organic layer is formed, and is formed of a transparentconductive material. The upper electrode is desirably formed thinner forimproving the light transmittance. However, as the upper electrodebecomes thinner, the resistance value rises and a voltage drop occurs.For this reason, unevenness of luminance is likely to occur between anedge portion of the display area and a central portion of the displayarea.

In an organic EL display device disclosed in JP 2010-027504 A, a routedwiring provided in a non-display area on the outside of a display areaof a sealing substrate that is arranged to face an element substrate isconnected with a cathode of the element substrate, for achieving the lowresistance of a cathode as an upper electrode and achieving a narrowpicture-frame. Moreover, in an organic EL display device disclosed in JP2008-511100 A, when two or more light-emitting layers of differentcolors are stacked to emit light, an intermediate connection layer isprovided between the light-emitting layers.

SUMMARY OF THE INVENTION

It is considered that the above-described organic EL display devices areeffective for achieving the low resistance of the cathode. However, themanufacturing process is complicated, and it is difficult to eliminatethe unevenness of luminance between the edge portion of the display areaand the central portion of the display area.

The invention has been made in view of the circumstances describedabove, and it is an object of the invention to provide an organic ELdisplay device in which the low resistance of an upper electrode formedon the whole surface of a display area is achieved without complicatingthe manufacturing process.

An organic EL display device according to an aspect of the inventionincludes: a lower electrode that is made of a conductive inorganicmaterial and formed in each of sub-pixels arranged in a matrix in adisplay area; a light-emitting organic layer that is in contact with thelower electrode and made of a plurality of different organic materiallayers including a light-emitting layer emitting light; an upperelectrode that is in contact with the light-emitting organic layer,formed so as to cover the whole of the display area, and made of aconductive inorganic material; and a conductive organic layer that is incontact with the upper electrode, formed so as to cover the whole of thedisplay area, and made of a conductive organic material.

In the organic EL display device according to the aspect of theinvention, the conductive organic layer may be formed on the inside ofthe upper electrode in a plan view.

The organic EL display device according to the aspect of the inventionmay further include, on the conductive organic layer, a sealing filmthat covers the outsides of the conductive organic layer and the upperelectrode in the plan view and is made of an inorganic material.

In the organic EL display device according to the aspect of theinvention, the conductive organic layer may planarize irregularities ofthe upper electrode.

The organic EL display device according to the aspect of the inventionmay further include a conductive inorganic film that is in contact witha surface of the conductive organic layer on the side opposite to asurface thereof on which the upper electrode is formed, formed to coverthe whole of the display area, and made of a conductive inorganicmaterial.

In the organic EL display device according to the aspect of theinvention, the conductive organic layer may be formed of a chargegeneration layer.

In the organic EL display device according to the aspect of theinvention, the light-emitting organic layer may have a configuration inwhich a plurality of the light-emitting layers are disposed in a tandemarrangement, and a charge generation layer may be arranged between theplurality of light-emitting layers.

In the organic EL display device according to the aspect of theinvention, an inorganic substance for increasing conductivity may beadded to a material of the conductive organic layer.

In the organic EL display device according to the aspect, of theinvention, the conductive organic layer may include ions injected afterdeposition.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram schematically showing an organic electroluminescencedisplay device according to an embodiment of the invention.

FIG. 2 is a diagram schematically showing a cross-section taken alongthe II-II in FIG. 1.

FIG. 3 is a diagram showing detailed configurations of a cross-sectionof a sub-pixel and a cross-section of an edge portion.

FIG. 4 is a plan view schematically showing areas where a conductiveorganic film, an upper electrode, and a sealant are arranged.

FIG. 5 is a diagram showing the case where any of an R light-emittinglayer, a G light-emitting layer, and a B light-emitting layer is formedin a light-emitting organic layer.

FIG. 6 is a diagram showing the case where the light-emitting organiclayer includes the B light-emitting layer and a Y light-emitting layerdisposed in a tandem arrangement.

FIG. 7 is a diagram showing the case where the light-emitting organiclayer includes the B light-emitting layer and an R+G light-emittinglayer disposed in a tandem arrangement.

FIG. 8 is a diagram showing the case where ions are injected into aconductive organic film in FIG. 5.

FIG. 9 is a diagram showing the case where ions are injected into aconductive organic film in FIG. 6.

FIG. 10 is a diagram showing the case where ions are injected into aconductive organic film in FIG. 7.

FIG. 11 is a diagram showing the case where the thickness of theconductive organic film is changed.

FIG. 12 is a diagram showing another case where the thickness of theconductive organic film is changed.

DETAILED DESCRIPTION OF THE INVENTION

Hereinafter, an embodiment of the invention will be described withreference to the drawings. In the drawings, the same or equivalentelements are denoted by the same reference numerals and signs, and aredundant description is omitted.

FIG. 1 schematically shows an organic electroluminescence display device100 according to the embodiment of the invention. As shown in thedrawing, the organic electroluminescence display device 100 includes twosubstrates, a TFT (Thin Film Transistor) substrate 120 and a countersubstrate 150, between which a transparent resin filler 221 (refer toFIG. 2) is sealed. A display area 205 composed of pixels 210 arranged ina matrix is formed in the TFT substrate 120 and the counter substrate150 of the organic electroluminescence display device 100. The pixel 210is composed of three sub-pixels 212 from which lights corresponding tothree colors of R (red), G (green), and B (blue) are emitted.

A driver IC (Integrated Circuit) 182 as a driver circuit that applies,to a scanning signal line of a pixel transistor arranged in each of thepixels 210, a potential for providing electrical continuity between thesource and drain of the pixel transistor, and also applies, to a datasignal line of each of the pixel transistors, a voltage corresponding tothe gray-scale value of the pixel is placed on the TFT substrate 120.Moreover, an FPC (Flexible Printed Circuit) 181 for inputting imagesignals or the like from the outside is attached to the TET substrate120. In the embodiment, each of the sub-pixels 212 includes an organicelectroluminescence element that emits white light, and the lightshaving wavelength ranges corresponding to the respective colors areemitted using color filters corresponding to the respective colors andarranged on the counter substrate 150. However, a configuration may beadopted in which each of the pixels includes an OLED that emits adifferent color of light. Moreover, in the embodiment, the organicelectroluminescence display device 100 is a top-emission type organicelectroluminescence display device that emits light toward the side ofthe TFT substrate 120 on which a light-emitting layer is formed, asindicated by the arrow in the drawing. However, the organicelectroluminescence display device 100 may be a bottom-emission typeorganic electroluminescence display device.

FIG. 2 is a diagram schematically showing a cross-section taken alongthe in FIG. 1. As shown in the cross-sectional view, a TFT circuit layer121 in which TFT circuits are formed, a plurality of organicelectroluminescence elements 130 formed on the TFT circuit layer 121,and a sealing film 125 covering the organic electroluminescence elements130 to block moisture are formed on the TFT substrate 120. The organicelectroluminescence elements 130 as many as the sub-pixels 212 areformed. However, some of the organic electroluminescence elements 130are omitted in FIG. 2 for facilitating the description. A color filterand black matrix layer 151 including R, G, and B color filters and ablack matrix as a light-shielding film that blocks light emitted througheach boundary between the sub-pixels 212 is formed on the countersubstrate 150. The filler 221 between the TFT substrate 120 and thecounter substrate 150 is sealed by a sealant 222.

FIG. 3 is a diagram showing detailed configurations of a cross-sectionof the sub-pixel 212 of the organic electroluminescence display device100 and a cross-section of an edge portion of the organicelectroluminescence display device 100. As shown in the drawing, thesub-pixel 212 includes: a passivation film 122 formed on the TFT circuitlayer 121 on the TFT substrate 120; a planarization film 123 made of anorganic material and formed on the passivation film 122; a lowerelectrode 131 formed on the planarization film 123 and electricallyconnected with an electrode of the TFT circuit layer 121; a pixelseparation film 124 made of an insulating film and covering an edgeportion of the lower electrode 131 to thereby separate the sub-pixels212 from each other; a light-emitting organic layer 132 formed on thelower electrode 131 and the pixel separation film 124 so as to cover thedisplay area 205 and including an organic layer including alight-emitting layer; an upper electrode 133 formed on thelight-emitting organic layer 132 so as to cover the display area 205 andmade of a transparent conductive film such as of ITO (Indium Tin Oxide);a conductive organic film 134 formed so as to be in contact with theupper electrode 133 and made of a conductive organic material; and thesealing film 125 made of an insulative organic film or multiple layersof an insulative organic film and an inorganic film. The plurality oflayers forming the sealing film 125 include a first inorganic sealinglayer 231 made of inorganic material such as SiN and SiOx; an organicsealing layer 232 formed on edges of recesses on the first inorganicsealing layer 231 and made of resin such as acrylic resin; and a secondinorganic sealing layer 233 formed on the organic sealing layer 232 andmade of inorganic material. However, the sealing film 125 is not limitedto include the plurality of layers, but may include a single layer. Thelight-emitting organic layer 132 is formed on the whole surface of thedisplay area 205. However, the light-emitting organic layer 132 may beformed in each of the sub-pixels 212 corresponding to the respectivecolors of R, G, and B. In this case, the color filter and black matrixlayer 151 may not be formed. Moreover, the sealing film 125 may not bemultiple layers but a single layer.

For example, when the light-emitting organic layer 132 includes aplurality of light-emitting layers and the light-emitting organic layer132 has a so-called tandem arrangement, a charge generation layer (CGL)may be deposited between the light-emitting layers. Moreover, theconductive organic film 134 may include a charge generation layer madeof a material similar to that of the above-described charge generationlayer. Irrespective of whether the light-emitting organic layer 132 hasa tandem arrangement or not, the conductive organic film 134 may includea charge generation layer. As the conductive organic material, polymeracetylene, polythiophenes, and a polymer composite can be used.Moreover, PEDOT:PSS[Poly(3,4-ethylenedioxythiophene):Poly(styrenesulfonate)] may be used asthe conductive organic material. Further, as the material of theconductive organic film 134, one obtained by adding an inorganicsubstance having conductivity to a conductive organic material or anon-conductive organic material through simultaneous formation orco-evaporation may be used. As the inorganic substance havingconductivity, amorphous carbon or a carbon nanotube can be used.Moreover, quantum dots may be formed. Moreover, performing ionimplantation such as of, for example, proton after deposition of theconductive organic film 134 is also effective for improving theconductivity of the conductive organic film 134.

In the drawing showing the cross-section of the edge portion of theorganic electroluminescence display device 100 shown in FIG. 3, thesealing film 125 is formed to the edge portion of the organicelectroluminescence display device 100 on the passivation film 122 ofthe TFT substrate 120. The upper electrode 133 is formed to the inside(the display area 205 side) of the edge portion of the organicelectroluminescence display device 100, and the conductive organic film134 is formed to the inside (the display area 205 side) of an edgeportion of the upper electrode 133.

FIG. 4 is a plan view schematically showing areas where the conductiveorganic film 134, the upper electrode 133, and the sealant 222 arearranged. For convenience of description, in FIG. 4, the configurationson the outside of the display area 205 are shown by hatching. In an areawhere the configurations are overlapped each other, only a memberarranged on the uppermost side is shown by hatching. As shown in thedrawing, an outer perimeter 133 a of an area where the upper electrode133 is deposited is on the outside of an outer perimeter 205 a of thedisplay area 205 in the plan view, and is on the inside of an innerperimeter of an area where the sealant 222 is arranged. An outerperimeter 134 a of an area where the conductive organic film 134 isdeposited is on the outside of the outer perimeter 205 a of the displayarea 205, and is on the inside of the edge (the outer perimeter 133 a)of the upper electrode 133. By adopting such a configuration, even whenan organic material like the conductive organic film 134 is arranged onthe upper electrode 133, the conductive organic film 134 is confinedbetween the sealing film 125 and the upper electrode 133. For thisreason, moisture can be prevented from entering the conductive organicfilm 134. Further, the end portion of the conductive organic film 134does not extending beyond the upper electrode 133 for the reason thatthe conductive organic film 134 is formed after the upper electrode 133is formed. As such, an uneven surface in the conductive organic film 134is not generated by the upper electrode 133. Accordingly, it is possibleto prevent generation of a crack due to the uneven surface. Moreover,the conductivity of the conductive organic film 134 can be made higherthan that of a transparent electrode such as of ITO constituting theupper electrode 133. For this reason, since the conductive organic film134 is formed in contact with the upper electrode 133, the resistance ofthe upper electrode 133 can be substantially reduced. Hence, by formingthe conductive organic film 134 on the upper electrode 133 so as tocover the display area 205, the low resistance of the upper electrode133 is substantially achieved. For this reason, the potential of acathode can be maintained even in a bright screen that requires a largecurrent, so that image quality can be improved.

FIGS. 5 to 10 are diagrams each schematically showing a configurationexample of the light-emitting organic layer 132 and layers stacked inthe light-emitting organic layer 132 of the sub-pixel 212. In thedrawings, a hole transport layer (HTL) and an electron transport layer(ETL) are not illustrated. FIG. 5 is a diagram showing the case whereany of an R light-emitting layer, a G light-emitting layer, and a Blight-emitting layer is formed in the light-emitting organic layer 132.As shown in the drawing, the conductive organic film 134 is formed onthe upper electrode 133. For this reason, the conductivity of the upperelectrode 133 can be substantially increased.

FIG. 6 shows the case where the light-emitting organic layer 132includes a B light-emitting layer 141 and a Y (yellow) light-emittinglayer 143 disposed in a tandem arrangement. In this case, since a chargegeneration layer 142 is arranged between the B light-emitting layer 141and the Y light-emitting layer 143, the B light-emitting layer 141 andthe Y light-emitting layer 143 can simultaneously emit light. Even inthe case of such a configuration, since the conductive organic film 134is formed on the upper electrode 133, the conductivity of the upperelectrode 133 can be substantially increased. In this case, theconductive organic film 134 may be formed of the same material as thatof the charge generation layer 142.

FIG. 7 shows the case where the light-emitting organic layer 132includes the B light-emitting layer 141 and an R+G light-emitting layer144 disposed in a tandem arrangement. In this case, by arranging thecharge generation layer 142 between the B light-emitting layer 141 andthe R+G light-emitting layer 144, the B light-emitting layer 141 and theR+G light-emitting layer 144 can simultaneously emit light. Even in thecase of such a configuration, since the conductive organic film 134 isformed on the upper electrode 133, the conductivity of the upperelectrode 133 can be substantially increased. Similarly to FIG. 6, theconductive organic film 134 may be formed of the same material as thatof the charge generation layer 142.

FIGS. 8 to 10 are diagrams showing the cases where ions 148 are injectedinto the respective conductive organic films 134 in FIGS. 5 to 7. Here,proton, for example, can be used for the ions 148. With such aconfiguration, the conductivity of the conductive organic film 134 canbe further increased. Due to this, the resistance of the upper electrode133 that is substantially in contact with the conductive organic film134 can be further reduced.

FIG. 11 is a diagram showing the case where the thickness of theconductive organic film 134 is changed. The conductive organic film 134in FIG. 11 is formed thick so as to fill steps generated by the pixelseparation films 124. Since the conductive organic film 134 is formedthick, the low resistance is achieved, and therefore, the conductivityis increased. For this reason, it is possible to achieve the lowerresistance of the upper electrode 133 that is substantially in contactwith the conductive organic film 134.

FIG. 12 is a diagram showing another case where the thickness of theconductive organic film 134 is changed. In this case, the conductiveorganic film 134 fills the steps generated by the pixel separation films124, and in addition, an upper surface of the conductive organic film134 is planarized, which is different from the case of FIG. 11. Further,a transparent conductive film 135 made of a conductive inorganicmaterial such as ITO is formed on the conductive organic film 134 so asto cover the display area 205. With such a configuration, the lowresistance of the upper electrode 133 can be substantially achieved, andan upper surface of the transparent conductive film 135 can beplanarized. When the sealing film 125 is formed of a plurality oflayers, the number of layers constituting the sealing film 125 can bereduced due to the planarization.

In the embodiment described above, the plurality of layers forming thesealing film 125 include the first inorganic sealing layer 231, theorganic sealing layer 232, and the second inorganic sealing layer 233.However, the first inorganic sealing layer 231 and the organic sealinglayer 232 may be eliminated by utilizing the conductive organic film134. The reason is as follows. The first inorganic sealing layer 231normally prevents external moisture from penetrating into thelight-emitting organic layer 132. However, in a case where an extraneousparticle or the like exists on a layer on which the first inorganicsealing layer 231 is formed, the first inorganic sealing layer 231 isnot formed sufficiently on the periphery around the particle, which maycause penetration of moisture. Further, in some cases, the firstinorganic sealing layer 231 is not formed sufficiently in recessesformed due to the edges of the pixel separation film 124. For the abovereasons, the TFT substrate 120 is provided with the organic sealinglayer 232 that is formed comparatively well on positions on which thefirst inorganic sealing layer 231 is not sufficiently formed, such asthe periphery around the extraneous particle or the recesses formed dueto the edges of the pixel separation film 124. Moreover, the organicsealing layer 232 can planarize the unevenness caused in the peripheryaround the extraneous particle or caused by the recesses formed due tothe edges of the pixel separation film 124. As such, there is noposition where the second inorganic sealing layer 233 is insufficientlyformed and penetration of external moisture is prevented enough. Thefirst inorganic sealing layer 231 prevents moisture of the organicsealing layer from causing a harmful effect on the light-emittingorganic layer 132.

The conductive organic film 134 is provided in the embodiment describedabove. The conductive organic film 134 is well formed on positions onwhich the first inorganic sealing layer 231 is not sufficiently formed,such as the periphery around the extraneous particle or the recessesformed due to edges of the pixel separation film 124. Accordingly, theorganic sealing layer 232 may be eliminated. Further, the elimination ofthe organic sealing layer 232 solves a concern about the moisture fromthe organic sealing layer 232, and thus the first inorganic sealinglayer 231 can be eliminated. In particular, moisture is hardly generatedfrom the conductive organic film 134 made of any of the above describedmaterials, such as, polymer acetylene, polythiophenes, a polymercomposite, PEDOT:PSS, conducive charge generation layer (CGL: ChargeGeneration Layer). Accordingly, the conductive organic film 134 canimprove the light-emitting organic layer 132 in durability, quality, andreliability.

In particular, in the structure as shown in FIGS. 11 and 12 where theconductive organic film 134 is formed for planarization, theplanarization eliminates the deficient forming of the sealing film 125that is caused by the extraneous particle and the recesses formed due toedges of the pixel separation film 124. This improves barrier againstmoisture and enables elimination of the first inorganic sealing layer231 and the organic sealing layer 232 without any problems.

In a case where it is not possible to compensate the deficient formingof the sealing film 125, which is caused by the extraneous particle andthe recesses formed due to the edges of the pixel separation film 124,by the planarization by the conductive organic film 134 and theconductive organic film 134 formed around an extraneous particle, thefirst inorganic sealing layer 231 and the organic sealing layer 232 maybe provided in the sealing film 125. The sealing film 125 may consist ofthe second inorganic sealing layer 233 and the organic sealing layer 232in a case where influence caused by moisture from the organic sealinglayer 232 is negligibly small, even if it is not possible to compensatethe deficient forming of the sealing film 125, which is caused by theextraneous particle and the recesses formed due to the edges of thepixel separation film 124, by the planarization by the conductiveorganic film 134 and the conductive organic film 134 formed around anextraneous particle.

The embodiment described above is not limited to a structure includingthe sealing film, but may be applied to a structure not including thesealing film. Further, the conductive organic film 134 may have afunction to reflect, or absorb, ray at a specific wavelength. Aconductive organic film having a function to block energy ray (forexample, ultraviolet ray, infrared ray, and electron ray) can reduceinfluence of the energy adversely affecting the light-emitting organiclayer 132 from outside light irradiated in use and in manufacturing.That can stabilize devices and improve durability of devices. Further,the refractive indexes are gradually changed in a process where lightemitted from the light-emitting organic layer 132 passes through theconductive organic film 134 and the upper electrode 133, so that theefficiency in light emission can be improved and a device that has highefficiency can be achieved.

While there have been described what are at present considered to becertain embodiments of the invention, it will be understood that variousmodifications may be made thereto, and it is intended that the appendedclaim cover all such modifications as fall within the true spirit andscope of the invention.

What is claimed is:
 1. An organic electroluminescence display devicecomprising: a substrate including a display area and a non-display areasurrounding the display area; a first electrode that is in the displayarea; a first organic layer that is on the first electrode and includesa light-emitting layer; a second electrode that is on the first organiclayer; a second organic layer that is on the second electrode; a firstinorganic layer that is on the second organic layer; a second inorganiclayer that is on the first inorganic layer and in contact with the firstinorganic layer in the non-display area, wherein the second inorganiclayer covers the first organic layer and the second organic layer inplan view.
 2. The organic electroluminescence display device accordingto claim 1, further comprising a third inorganic layer between thesecond organic layer and the first inorganic layer.
 3. The organicelectroluminescence display device according to claim 2, wherein thesecond organic layer is thicker than the third inorganic layer.
 4. Theorganic electroluminescence display device according to claim 1, furthercomprising an insulating film that is on the first electrode and coversan edge portion of the first electrode.
 5. The organicelectroluminescence display device according to claim 4, wherein a firstdistance and a second distance are distances between a top surface ofthe substrate and a top surface of the second organic layer; the firstdistance is in a first area that is included the insulating film in planview; the second distance is in a second area that is not included theinsulating film in plan view; and the first distance is bigger than thesecond distance.
 6. The organic electroluminescence display deviceaccording to claim 1, wherein the second organic layer is inside thefirst inorganic layer and the second inorganic layer in plan view. 7.The organic electroluminescence display device according to claim 2,wherein the third inorganic layer is conductive.
 8. An organicelectroluminescence display device comprising: a substrate including adisplay area and a non-display area surrounding the display area; afirst electrode that is in the display area and formed in each ofsub-pixels; a first organic layer that is on the first electrode andincludes a light-emitting layer; a second electrode that is on the firstorganic layer; a second organic layer that is on the second electrode; afirst inorganic layer that is on the second organic layer; a secondinorganic layer that is on the first inorganic layer and in contact withthe first inorganic layer in the non-display area, wherein the secondinorganic layer covers the sub-pixels successively.
 9. The organicelectroluminescence display device according to claim 8, furthercomprising a third inorganic layer between the second organic layer andthe first inorganic layer.
 10. The organic electroluminescence displaydevice according to claim 9, wherein the second organic layer is thickerthan the third inorganic layer.
 11. The organic electroluminescencedisplay device according to claim 8, further comprising an insulatingfilm that is on the first electrode and covers an edge portion of thefirst electrode.
 12. The organic electroluminescence display deviceaccording to claim 11, wherein a first distance and a second distanceare distances between a top surface of the substrate and a top surfaceof the second organic layer; the first distance is in a first area thatis included the insulating film in plan view; the second distance is ina second area that is not included the insulating film in plan view; andthe first distance is bigger than the second distance.
 13. The organicelectroluminescence display device according to claim 8, wherein thesecond organic layer is inside the first inorganic layer and the secondinorganic layer in plan view.
 14. The organic electroluminescencedisplay device according to claim 8, wherein the first inorganic layercovers the sub-pixels successively.
 15. The organic electroluminescencedisplay device according to claim 9, wherein the third inorganic layeris conductive.